Improvement in devices for keying paving-blocks



bindet tatt l PDRLEY D. GUMMINGS,

or PORTLAND, MAINE.

Letters Patent No. 108,977,'dated November' 8, 1870.

IMPROVEMENT IN DEVICES FOR KE'YING PAVING-BLOCKS.

The Schedule referred to lx1 these Letters-Patent and making partnof thename.v

Totali whom it may concern Be it known that I, PERLEY D. OUMMINGS, of'Portland, inthe county of Cumberland and State'of Maine, have invented anew and useful Machine for' Keying Wooden Pavements; and I herebydeclare the following to be a full,`clear, :and exact description of thesame, reference being Vhad 'to the accompanying drawing, in whichg-Figure'lis a side elevation,with the outside casing removed;

Figure 2 is a top plan ;v and Figure 3 is a detail ofthe device forclosing the endv of the machine. l

Same letters refer to like parts.

The frame of the machine consists of ,two horizontalbeams, D and E,irmlybolte-d together at theex'- tremities. i ,Y i

Two shafts, F and G, pass through the beams D and E. The shafts. andtheir relativepositions are shown in tig. l. Y

On the shaft F, betweenl and E, is-ixed a grooved wheel, A, while on'the shaft Gr are two fixed wheels, one a grooved sprocket-wheel, B,between D and'E, and the other outside the beam E, to which a band maybe applied.

Over the wheels A and B passes an endless chain.

The *frames @beams D and E are. bbtli yprovided with tongues ou theirinner and upper edges; and be-' tween these tongues runs the dog H,having on either side grooves, into which the tongues before named tit.The shape ot'y the dog H is shown iu fig. l'.

The dog is provided, at it's inner end, with the movable claw, I', whichis pivoted at J, and so made as to clasp the vertical-links of the chain0.

.lo the other end of the dog is attached a band or rope, which passesunder the wheelK and over the wheel-L, after which a weight is attachedto it.

rOn the beam D isa guide, N, having a smooth inner surface',0 0.

0n the beam E are keyed guides I P P, placed, as required, between thecenter of the vmachine and the wheel A, whileA from theA center ofthebeamto the other end thereof is the guide, which visplaced on theupper and outer edge of the beam. Y

lHinged at the estremity of the same is the gate R,

which' has a notch or bifurcation (shown in dotted lines at S iufig. 3)at its inner end.

The gate, when closed,'ills the opening between the guidesN and Q, andis so held by the's'lide T, which moves between the guides or supports Uand Y. `Theinne`r end of the slide T is beveled, and has two notches,into which the bifurcation ofthe gate R The object df the device is tokey together theblocks of which wooden pavements are formed.'

Inlthe operation, the blocks are placed on the beam E, between theguides Q aud N, with the end in which the'key-way has been eut nexttothe guide N. The

board `on which the key has been placed is Iput bef tween the guides I Pand N, the key resting ou snp- .ports on the inner surface of the guidesP I?. Pwer being appliedto the shaft G, the chain is carried around thewheels A and B. This carries with it thev dog H, the thin projection onwhich strikes the board W', tig. 2, and forces the key into thekey-wayot' the blocks.

. When the key has entered the last block the board strikes the bevelededgeof the slide T, forcing back the slide, and thus opening the gate1t.

At the same time that the blocks are allowed to pass out, the claw ofthe dog is ihre-ed up by the sprocket of the wheel, or its holdisloosened 4bytheincline of chain ovcrfthe wheel D, and the dog runs backto the posit-ien shown in g. 1.

It is evident the key-board may be kept stationariyl' and the blocksforced thereon. When the key-board is so short that the dog does notstrike it, a piece of board may be place;l between the dog and thekey-board.

What I claim as my invention, and desire to secure vby Letters Patent ofthe United States, is

l. The method ot keying blocks, for the manufacture of wooden pavements,as set torth herein, to wit, by means of the wheel A, sprocket-wheel B,the endless chain C, and the reciprocating dog H 2. The beveled slide T,operated by means of the key-board, and openingthe end of the machine.

Witnesses: I. D. OUMMINGS.-

WM. FRANKLIN SEAVEY.. GEORGE E. BIRD.

